Brake



Dee. 21, 1937.

L, E. LA BRIE BRAKE Filed sept. 12, 19:55

- INVENToR. 0065/95 /P/f' ATTORNEY Patented Dec. 21, 1937 I y UNITED STATES PATENT GFFEQE BRAKE Ludger E. La Brie, South Bend, Ind., assignor to Bendix Aviation Corporation, South Bend, Ind., a corporation of Delaware Application September 12, 1935, Serial No. 40,291

4 Claims. (Cl. 18S-'78) This invention relates to brakes, and is illus- |22 (Figure 3) and spacer sleeve |24 mounted trated as embodied in internal expanding autothereon between the end plates. mobile brakes of the shiftable anchorage type. Shaft I |8 is yieldingly held in place by a spring An object of the invention is to provide novel |26, confined between the outer end plate |20 and and improved positioning means for the brake a snap-ring in the end of the shaft, the spring shoes or their equivalents. This means is intendurging the shaft upwardly in Figure 4 until a ed to be carried by the backing plate of the snap-ring |28 carried by the shaft engages the brake, and preferably includes a novel adjustable second end plate |20. The shaft also carries stop for one of the shoes, shown as including a a washer |30 covering an enlarged opening in 10 xed pin engaging the shoe web at its end and the backing plate through which the shaft pro- 10 carrying a roller engaging the shoe rim. Means jects.

may be provided for turning the roller eccentri- Pivots |42 are formed with reduced-diameter cally on the pin to adjust it, for example a pinion ends slidingly engaging the backing plate. 01 the like operable from outside the brake. The brake also includes a shoe-positioning de- Other objects and features, including various vice shown in detail in Figures 4 and 5. This de- 15 novel combinations of parts and desirable parvice includes a cam-shaped or eccentric-edged ticular constructions, will be apparent from the roller |44 engaging the inner face of the shoe rim, following description of the illustrative embodiand having welded or otherwise secured'thereto ments shown in the accompanying drawing, in the hub of a stamping |46 having a base engagwhich: ing the backing plate. The roller |44, with the 20 Figure 1 is a partial sectional view vertically attached operating member |46, is sleeved on a through the brake, just inside the head of the pin |48 riveted to the backing plate and having brake drum, and showing the shoes in side eleits end in supporting engagement with the side of vation; the shoe web. A spring |50 is compressed between Figure 2 is a partial section on the line 2-2 of roller |44 and a snap-ring |45 in the end of pin 25 Figure 1, showing the adjusting means of this |48.

brake; The base of member |46 is formed with teeth Figure 3 is a partial radial section theremeshing with the teeth of a small pinion |52 through, on the line 3-3 of Figure 1; and formed or mounted on an operating shaft |54 ex- Figures 4 and 5 are partial sections, on the lines tending through the backing plate and formed to 30 4--4 and 5 5, showing the adjustable stop of my be grasped by a wrench or the like. A sprin |50 improved shoe-positioning means. sleeved on the shaft |54 is compressed between a In the brake illustrated, shoes 24 and 26 are snap-ring |55 on the shaft and a locking washer associated with a drum 2| and a backing plate 22 |58 keyed on the shaft. Washer |58 is formed as described in my Patent No. 2,044,990, granted with an annular series of openings yieldingly en- 35 June 23, 1936. The particular drum shown in gageable, against the resistance of spring |56, the drawing is covered by my Patent No. 2,057,725, with a locking projection |50 carried by the backgranted October V20, 1936. ing plate.

In this brake, the shoes have at their lower ends Whiletwo illustrative embodiments have been sockets |08 formed by registering grooves in described in detail, it is not my intention to limit 40 stampings ||0 spot-welded or otherwise secured the scope of my invention to those particular emto the webs of the shoes. stampings ||0 also bodiments, or otherwise than by the terms of the carry transverse pivots |42 having central threadappended claims.

ed openings adjustably receiving oppositely-ex- I claim: 45 tending right-and-left threaded stems formed on 1. A brake positioning device adapted to be 45 an adjusting member H4. mounted on a brake backing plate and compris- Member ||4 is shown centrally formed with a ing a fixed pin to be carried by the plate and worm wheel IIB meshing with and driven by a adapted to engage and support at its end the web worm formed on a cross shaft ||8, floating with of a brake shoe, a roller eccentrieally mounted on the above-described adjustable joint, and the the pin and adapted to engage and support the 50 end of which extends outside the backing plate rim of said shoe, and a device for turning the and is there formed to be grasped by a wrench. roller including a pinion having an operating Shaft l|8 is journaled in two end plates |20, stem extending through the backing plate. slotted to be mounted on the reduced-diameter 2. A brake positioning device comprising a pin,

ends of the pivots ||2 and. held by a clamp bolt aroller sleeved on the pin, a spacer secured to the 55 roller and having a hub sleeved on the pin, and a spring engaging the roller and urging the roller and spacer yieldingly to a, position determined by the spacer.

3. A brake positioning device comprising an eccentrically-pivoted roller having secured thereto a base spaced from said roller and formed with teeth in its periphery, and an operating member having teeth meshing with the teeth Vof said base.

4. A brake positioning device comprising an eccentrically-pivoted roller having secured thereto a. base spaced from said roller and formed with teeth in its periphery, an operating member having teeth meshing with the teethrof said base, and a yielding locking device for the operating member.

LUDGER E. LA BRIE. 

